diff --git a/backend/config.json.default b/backend/config.json.default
index b03ff3c..8af97de 100644
--- a/backend/config.json.default
+++ b/backend/config.json.default
@@ -90,6 +90,13 @@
             "etherspotPaymasterAddress": "0x8A41594e5c6Fe492e437414c24eA6f401186b8d2"
         }
     },
+    {
+        "chainId": 5001,
+        "bundler": "https://mantletestnet-bundler.etherspot.io/",
+        "contracts": {
+            "etherspotPaymasterAddress": "0xb56eC212C60C47fb7385f13b7247886FFa5E9D5C"
+        }
+    },
     {
         "chainId": 8217,
         "bundler": "https://klaytn-bundler.etherspot.io/",
@@ -160,4 +167,4 @@
             "etherspotPaymasterAddress": "0xcaDBADcFeD5530A49762DFc9d1d712CcD6b09b25"
         }
     }
-]
\ No newline at end of file
+]